Copying lathe



Apnl 5 1927 H. A. SCHUL-rz COPYING LATHE Filed March 29, '1924 5Sheets-Shea?. 1

-COPYING LATHE Filed March 29, 1924 5 Sheecs--SheeiI 2 Y 1 623,538 April5, 1927. H. A. SCHUL-TZ COPYING;` LATHE Filed March 29; 1924 5sheets-sheet s April 5, 1927. 1623,638

H. A. SCHULTZ COPYING LATHE Filed MaIOh 29, 1924 5 Sheets-Sheet 4 April5, 1927. 1,623,638

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l rae-Lied Apr. 51, isz-L 7 'UNITE-n ls rares 'PATENT' orgies.'

Immun A. scrIULTz, Y

l THE '.rowNsHIroF MOHENBY, ILLINOIS.

4to lathes COPYING LA'II'IE.-

nppncation mea Maren 29,'1924.l serial no. 702,812.1

Myfinvention relates, more particularly, provided for the manufact-ureof shoe-lasts and more especiallyv graded shoel'asts and of the typecomprising, as an ele-l ment, a ,swing-frame. which, in lathes of this`type as colnmonly provided,fhas revolubly.

mounted thereon the lpattern and the work, to cooperate with apattern-follower and the cutter, respective y. v

The grading of the lasts to be produced by machines of this type isaccomplished by the provision of mechanism controlled by the swingingmovements of the swing-'frame and operatinfto produce a differentialmovement of the pattern-follower relative to the cutting mechanism whichoperates on the work, and as the swing-frame moves in'an ar, it is thusimpossible to produce graded lasts from a pattern, which shall presenteX- actly the same contour as the pattern but of enlarged, ordiminished, size, as the case may be. Furthermore, even in' the case ofmaking a last of the pattern size it is not possible to produce such alast of exactly Vthe same contour asthe pattern due to the swinging ofthe frame in an arc.

As machines have been hitherto Idirovided,l

. the error above referred to, especially in the case of the largersizes of lasts produced, is so great as to present great objection inthe manufacture of lasts, and it is my primary objectto provide,improvements in machines of the swing-frame type to' the 'end that theerror referred to and occurring nthe lasts will be so minimized as toVbe practically negligible, the lasts produced, for allpracticalpurposes, having the `same contour as the pattern exce t ofenlar ed .or diminished size in the case of grade lasts.

In explanation of the production of the f objectionable error in thelasts above referred to in the case ofmachines as hitherto constructed,it may be statedtha't the parts of the machine are so proportioned andarranged that the swinging movementstof,

vthe frame in the ordinary movements thereof in producing a last arewholly to one side' of the vertical plane in which the pivot of i theswing-frame extends, and this I overswinglng movementsl 'swings come,generally stated, by so. proportioning and arranging the Apartsthattheframe in its at' -opposite sides of such vertical plane.

- -iAnother object is to provide improvements in lathes of the generalcharacter above reoFeHIcAGo, ILLINoIs, AssIGNon 'ro CHARLESV Arequiringto be operated positions they nnnnnorpractical operation atrelativelyrapid speed, 60 without causing the lasts produced thereby topresent Vany greater degree of error above referred to, than is producedin machinesas hitherto provided where a swing-frame presenting a longlever-arm,

at relatively slow speed, is provided. I' f While my inventionapplicable enerally to machines of the type above re erred to, I havedevised itrforenibodiment i especially in 'a machine of the-generalconstruction shown in the pending application of Charles E. Reed forUnited States Letters Patent, Serial No. 650,194, filed Ju1y 7, 1923,and have therefore chosen` to villus- 75 trate it in such machinewithout, however, intending to be understood as desiring to limit theinvention thereto.

Referring to the accompanying drawings:

Flgure 1 is a`vi'ew in front elevation of a so machine of the general'construction disclosed in the above referred-to pending applica-` tion,showing the machine as equipped with my present improvement. Figure 2 isan end view thereof, viewing 1 and the swing' frame swung out forwardlyto lockedv inoperating position. Figure 3 is a plan view of ythemachine'with the upper works thereof shown in section and the swingingframe 90 removed. Fi re 4 is an enlarged section 'taken'at thehne 1f-4on Fig. 1 and viewed in the direction being shown in the positionillustrated in Fig. 2; and Figure 5, an enlarged broken 95 e upperswing-frameequipped Y view of th portion of the machine, the machinebeing viewed from the left hand side ofFig. 1," with certain ing theswing-frame and its ing mechanism, by full lines in one of the may occuof the machine and by position in which they may extend.

c XReferring to the particular illustrated ma- 15f chine, whichisadaptedfor the turning 'of lasts of the pattern size or graded, asdesired, the same comprises a frame 25 providedad jacent its rear sidewith a guide-way 26 and adjacent its front side with and consequently 35more 70 v the machine from 35 the right hand end in Fig.

of the arrows, the machine 'i y in the operation, otted lines anotherupwardly-ex- 11o parts removed, this view. show- 'i f counter-weight-A100 members 30. Mounted on the guide-,ways 26 and 27 is a slide 31 whichcarries the cutting mechanism for cutting the work mounted in theswing-frame, as hereinafter described,

this cutting mechanism, corresponding with the cutting mechanism of thesaid pending application, involving, generally stated, a roughing-cutter32 formed of a plurality of toothed disks of'successively largerdiameters flatwise disposed on a shaft 33 driven from the shaft of amotor 34 secured on the slide 31, through the medium of a gearing (notshown) located in a gear-housing 35, the cutting portion of theroughing-cutter 32 being of general frustro-.conical form as shown. Thecutting mechanism also coinprises a finishing cutter represented at 36formed of diametrically-opposed cup-sliaped cutters 37 and 38 mounted ona shaft 39 and driven from the gearing in the housing 35.

Mounted on the guides 26 and 28 for movement in a direction lengthwiseof the machine, is a sli-de 40 provided with guides, extending crosswiseof the machine, on which a slide 41 is mounted to be movablelongitudinally thereon, the slide 41 carrying the pattern-followerrepresented at 42. The slide 41 is provided witha rearwardly-extendingplate 43 (Fig. 4) mounted in a slide 44 vertically adjustable on themain body of the slide 41, the plate 43, opposing the front face of aplate 45 extending lengthwise of the machine and trunnioned at itsopposite ends, as represented at 46, 4to the frame to rock crosswise ofthe machine on a horizontal axis, the plate 45 being provided with anupwardly-extending arm 47 operatively'enga ing with mechanismhereinafter described for causing the plate 45 to be rocked, responsiveto the swinging movements of the swing-frame hereinafter described andcoinprisiiig a link 200 having pivotal connection at its rear end withthe lever 47 as represented at 201, and similar connection at itsforward end with the swing-frame referred to, as indicated at 202. Theslide 41 is caused to bear, at its plate 43, at all times, against thefront face of the plate 45, through the medium of a-spring 41a whichisattached at one end to the slide 41 and at its opposite end to the slide40.

The slides 31 and 40 are operatively connected together throughmechanism for causing them to move simultaneously in the same directionlengthwise of the machine, either at the same speed, to produce a lastof the exact size of the pattern hereinafter referred to, orat differentspeeds, to produce graded lasts, the said mechanismL shown being thesame as that illustrated in the said pending application, andcomprising, generally stated, a bar 48 pivotally connected at one end tothe slide 31, as indicated at 49, this bar being formed oflengthwise-adjustable sections 50 and 51 to vary the effective length ofthe bar 48. The end of the bar 48 opposite that at which it connectswith the slide 31 is pivotally connected, as indicated at 52, with theupper end of a rack bar 53 slidable up and down in a bar 54 slotted atits lower end, as indicated at 55, through which slot the pivoting stud'56 of a clamping device carried by a stationary bar 58 and adjustableAup and down on the latter, extends, the bar 58 being rigidly connected,at its oppo. site ends, with the frame of the machine, as shown. The bar53 is pivotally supported on the slide 40 through the medium of a pivot59 and carries a rack (not shown) which meshes with a pinion (not shown)in a gear-case 60 carried by the bar 54, the pinion referred to beingrigidly secured to a shaft 61 which is provided with a' crankhandle 62through the medium of which this pinion may be rotated to adjust the bar53 lengthwise of the bar 54, it being understoodthat by varying therelatively movable members forming the connecting mechanism described,the slides 31 and 40 may be moved simultaneously at the same speed forthe production of a last of the same length as the pattern, or differentspeeds, to produce longer or shorter lasts, as desired. The mechanismfor moving the slides 31 and 4() lengthwise of the machine to feed thepattern-follower and the cutting mechanism along the pattern and work,respectively, mounted in the swing-frame referred to, comprises, in theparticular construction shown, a shaft 63 journaled in a bearing 64which has slight rocking movement in a vertical plane on the frame ofthe machine, one end of this shaft carrying pulleys (55, connected by abelt 66, with pulleys 6T secure( to a shaft 68 forming the main drivingshaft of the machine and driven from a motor iepresented at 69. Theother end of the shaft 63 carries a worm 70 which meshes with aworm-wheel 71 secured toa shaft 72 jour. naled on the frame of themachine and mesh-- ing with a rack depending from the slide 31, theparts being so constructed and arranged that, when the worm meshes withthe worm-wheel 71, the slide 31 will be driven from the shaft 63 to theleft in Fig. l, and through the medium of the lever mechanismvhereinbefore described and connecting the slide 31 with the slide 40,the latter will be simultaneously moved in the same direction withtheslide 31, at the same speed, or at a different speed therefrom,depending upon the setting of the said lever mechanism. The machineshown is provided with means for effecting the automatic arresting ofthe drive A present invention has nothing to do with this tion thereofis omitted.

Referring now: to the swing frame of the mchinefand hereinafter referredto, thisv frame is' represented at 7 3, and forms a I swinging Supportfor the pattern 7 4 and the wood-blank 75, from which a last is to beformed, which are rotatably mounted therevvin,`and in the operation ofthe machine are rapidly rotated, all as hereinafter described.

The swing frame 73 is jouinaled', in the particular construction shown,at its upper ends on theframe standards 29 at hollow trunnions 76secured in the upper ends of the side arms 77 of the swing frame 73. The

trunnions 76 form journals for a shaft 78 ex-l tending therethrough andcarrying the stepped pulleys 79 through the medium of which it isdriverr to -rotate the pattern 74 and work 7 5, as hereinafterdescribed, by the belt connectionBO with other belt pulleys 8l securedon the sha-ft 68. The pattern 74 is mounted on' a head-stock 82 and atail-stock 83, and the work 7 5 is mounted on a head-stock` 84 and atail-stock 85, to respectively oppose the pattern-follower and cuttingmechanism hereinbefore referred to. The means shown, and which are theVsame as those of the herein-before-referred-to pending application, for

rapidly rotating the pattern 74 .and work 75, either in vthe same,oropposite, directions, as desired, comprise, generally stated, a shaftL86 journaled onv the frame and geared tothe spindles of the head-stocks82 and 84 to cause thelspindlesto operate simultaneously, by gearinglocated in housings 87 and 88 on the frame'73, and a shaft 89conopposite sides of the said vertical plane. I Vhave foundyit'vdesirable to so locate the axis nected with vthe gearing referredto and 'journaledv on this frame. The shaft 86 is driven, throughU themedium of bevel gears (not shown) located inthe housing 90, through themedium of ay shaft 91 having bevel gear connectionA at y92 with theshaft 78.

' In accordance 'with my invention, as hereinbefore stated, the parts ofthe structure are so'proportioned andV arranged that the swing frame 73,in the operation; of turning a last, swings alternately from one slde-to the other, .of the vertical plane in which .extends theaxis aboutwhich the frame 73 swingsLit being preferred that the parts be so.proportioned andarranged that the frame 73 in. the operations ofturning a last such as those of theform now commonly manufactured, willswing, in its extreme movements, substantially the same distance, at

upongwhich the frame l73 swings,l that the alined axes about which the'pattern and work rotate extend totheleft of the vert-ical aliningiaxesare co-incident with the lextreme forward point on the follower, asillustrated by the full lines in Fig. 5, assuming that the follower islined up with thel cutting mechanism. Such disposition of the parts verymaterially reduces the error above referred to, but to stillY furtherminimize such errol` the portions ofthe head and tail stocks 'in whichthe pattern and work are mounted are so disposed that their alined axeswill extend a slight distancer below the forwardmost point on thefollower when the swing-frame is in vertical position.

By way of example and assuming that the distance from the axes of thework and pattern to the pivotal support of the swing frame is thev sameas in machines as now commonly provided, the axes of the workand'pattern would preferably extend below the plane in which theforwardmost point of the follower extends, about l/ft of an inch, whenthe swingI frame is in "ertical position. 'g

In explanation of the advantages of so locating the axis about which theswing frame 7 fextends that the swing frame will swing to both sidesl ofthe vertical plane in which its pivoted axis extends, as abovedescribed, it may be stated that theideal arrangement, from thestandpoint of fully eliminating error in the lasts, would\ be to mountthe pattern and the workon a member which would slide in a straight linetoward and away from the follower and cuttingfmechanism. However, inpractice it is desirable to use :i swing-frame for the pattern and thework, and

thus the pattern and-the work move through tions, swings to'one sideonly of the vertical plane in which the axis upon which theswing frameswings, extends.'l In designing a mavchine to embody my invention, thedesigner, to properly locate the axisabout which the `swing-frameswings, gelative to thev patternfollower, would first determine thelength of the arc through which the pattern and the work move in themovement of the frame from one to the other of itsextreme positions inthe` cutting of lasts of the form` commonly produced, and then locatethe axis 'of the swing-frame so that when this vframe is in the fullline position shown in Fig. 5.v

AinL which position the alined vaxesof the pat; `tern and the work aresubstantially coincidentwith the forward point on the follower. these'Lalined axes will extend to the leftcf Cil lll

the vertical plane in which the pivoted axis of the swing-frame islocated, a distance equal to substantially one-half of the length of-thearc referred to. Y

It is necessary thatthe pattern 74 press against the pattern-follower'42at all times,

in the operation of the machine, whereby inv the rotation of the patternthe frame 73 is caused to oscillate byvirtue of the rotation of thepattern against the follower, to the l end that the blank, or work 75,will, in its rotation, be cut to present the same form as thel pattern.The particular illustrated mechanism for this purpose comprises a belt93 at each end of the machine, thewforward end of each Ibelt beingconnected with the lower portion of the frame 73 at each end thereof andextending over pulleys 94 fixed on the ends of a shaft 95 journaled onthe frame of the machine and provided with a sprocket 96 connected by asprocket chain 97 with a sprocket 98 secured to the shaft 78,

the shaft 95 being thereby .rotated in clock-` wise direction in Fig. 2.The belts 93 extend from the pulleys 94 to pulleys 99 rotatably mountedon shaft 100 and areprovided at their free ends with weights 101.

The weghtedbelt devices described, by reason of the constantly rotatingshaft 95,

operate to exert against the swing-frame 7 3,

at all times, force in a direction to swing the frame 73 incounter-clockwise direction in Fig. 2 and serve to exert a snubbingaction on the frame, preventing rebounding of the latter -away from'thepattern-follower and Fig. 5, will tend to swing to the right in,

this figure and consequently away from the -pattermfollower and cuttingmechanism and when this frame swings to the right of said verticalplane, as shown by dotted lines in Fig. 5, '1t will tend to swing towardthe pattern-follower and cuttingl mechanism,

means are' shown for compensating for this condition, these means,which, however, form no part of my invention as they were devised by oneCharles E. Reed and form the subject of an application for United StatespatentJ Serial No. 702,813 filed by him on March'29, 1924, andcopending` herewith comprise the following described mechanism: Rigidlysecured to theends of the shaft 100 are upwardly-extending levers 102each provided with a weight 103 at its upper end, these levers beingsimilarly positioned on the shaft 100and each connected,

through the medium of a link 104 pivoted thereto at 105, with levers 106rigidly secured to the ends of a `shaft 107 journaled in the frame ofthe machine. tions between the link 104 and the levers 106 The connecarepivotal as represented at 108 and located between the ends of theselevers, and

insuring'against deflection of the swingframe in the operations of themachine. It will be noted that in the particular construction shown Athedistance from thea'pivot points 105 to shaft 100 is much less than thedistance' from the pivot points 108 to the shaft 107, whereby theeverage is compounded thus causing the levers 102 to swingthroughgreater arcs, than the swing-frame, and thereby effectivelycounterbalancing the latter.

The lever mechanism just described, and as shown, is so arranged thatwhen the swing frame is in vertical position the levers 102 extendvertically upward and when this frame extends to the left in Fig. 5 asshown in full lines, these levers extend to the left as shown in fulllines, and when the swing frame extends to the right of the vertical asshown by dotted lines, the levers 102 also extend to the right of thisligure as shown by the dotted lines, the levers 102 thus serving tosubstantially counterbalance the force exerted by gravity against theswing frame and tending to swing the latter to vertical position. Whilethe arrangement is such as shown anddescribed that when the swing frameis vertical the levers 102 are vertical, it may be found desirable,under some conditions, to so modify this arrangement that the levers 102will'be slightly inclined in one direction, or the other, when the swingframe is vertical.

`It will beyundersftood from the foregoing that in the illustratedembodiment of my invent-ion, the force exerted bythe frame in thedirection of the pattern-follower and cutting mechanism is determined bythe force exerted'on the belts 93 which, in the preferred constructionshown, depends on the speed at which the shaft 95 rotates and the weightof the bodies 101.

While I have illustrated and described a particular constructionembodying my invention, I do not wish to be understood as intendin tolimit it thereto as the same may be modi ed and altered withoutdeparting from the spirit of my invention, and, as

will be C'readily understood, the invention may be incorporated. in amachine 1n which the swing-frame isy piifotaliy supported be- Idw theaxes of the work 'and` pattern, las Well as in a Imachine lin which 'thepivotal support is above said axes. f

What I `claim as new, anddesire toisecure .by Letters Patent, is:

lIn a last lathestructu're, lthe combination of a pattern-followerandcutting mechanism,a. swing-frame supporting a pattern and the work forcooperation with` said n Y n Y' n follower and rcuttingmechanism,respectlve- -1y and grading mechanism with which the swing-frame andpattern-fo lower are connectedmthe axisupon whlch said frame swingsbeingso located that said frame, in the cutting operation of themachine, swings to both sides of the'vertical plane iliiwhich said axisis located. e

. HERMN A. sCI-IULTZ.

